X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Foptimal-page-breaking.cc;h=5ad4daf9bf8ecf71c68df84e04eee3b424033b6a;hb=9e781b7dc83b60a543ce218aa1a5f139f74c760f;hp=2b0910f8873600feebf136424c8ffa823d0f93d6;hpb=233fb6a8b3b6e31de1841641dbbd4c4f43423151;p=lilypond.git

diff --git a/lily/optimal-page-breaking.cc b/lily/optimal-page-breaking.cc
index 2b0910f887..5ad4daf9bf 100644
--- a/lily/optimal-page-breaking.cc
+++ b/lily/optimal-page-breaking.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 2006--2012 Joe Neeman <joeneeman@gmail.com>
+  Copyright (C) 2006--2014 Joe Neeman <joeneeman@gmail.com>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -64,12 +64,21 @@ Optimal_page_breaking::solve ()
       best = space_systems_on_best_pages (0, first_page_num);
 
       page_count = best.systems_per_page_.size ();
-      min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
+      if (page_count == 0)
+        {
+          min_sys_count = 0;
+        }
+      else
+        {
+          min_sys_count = ideal_sys_count - best.systems_per_page_.back ();
 
-      if (page_count > 1 && best.systems_per_page_[page_count - 2] > 1)
-        min_sys_count -= best.systems_per_page_[page_count - 2];
+          if (page_count > 1 && best.systems_per_page_[page_count - 2] > 1)
+            min_sys_count -= best.systems_per_page_[page_count - 2];
 
-      min_sys_count = max (min_sys_count, (vsize)1);
+          if (min_sys_count > ideal_sys_count  // subtraction wrapped around
+              || min_sys_count <= 0)
+            min_sys_count = 1;
+        }
     }
   else
     {
@@ -103,7 +112,7 @@ Optimal_page_breaking::solve ()
 
   if (page_count == 1)
     message (_ ("Fitting music on 1 page..."));
-  else if (scm_is_integer (forced_page_count))
+  else if (scm_is_integer (forced_page_count) || page_count == 0)
     message (_f ("Fitting music on %d pages...", (int)page_count));
   else
     message (_f ("Fitting music on %d or %d pages...", (int)page_count - 1, (int)page_count));